S-8077A577 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments and chemical exposure.
• Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for high-load applications.
• Precise, reliable assembly ensured by Class 3A thread fit, reducing the risk of cross-threading and ensuring consistent clamping force.
• Enhanced durability and wear resistance from the black oxide finish, which also provides a sleek, non-reflective appearance.
• Secure, non-slip grip during installation thanks to the knurled head texture and hex socket drive for easy torque application.
• Accurate positioning and alignment with a standardized shoulder diameter and length, critical for precision machinery and rotating parts.
• Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This 5/16"-18 UNC shoulder screw in 316 stainless steel with a black oxide finish is engineered to address critical challenges in industrial settings, such as corrosion, high stress, and precise component alignment. Its robust Class 3A thread fit and knurled socket head ensure reliable fastening in vibrating or high-torque environments, reducing maintenance needs. The shoulder design provides a precise bearing surface, minimizing wear on connected parts in machinery, automotive assemblies, and precision instruments. By combining high tensile and shear strength with superior corrosion resistance, this screw delivers long-term performance in demanding applications like marine equipment, chemical processing, and aerospace components, where failure is not an option.

Specification Summary & Compliance

This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise UNC threading and tight tolerances (e.g., shoulder diameter tolerance of -0.004" to -0.002"). It is manufactured from 316 stainless steel with a black oxide finish, and complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability for industrial use.